AmbiguousMatchException: Ambiguous matching in method resolution

In Unity 2018.2 it seems like UnityEvents aren't correctly serialized anymore (see image attached below).

It looked fine and I got no exception in Unity 2018.1.

This is the console log:

AmbiguousMatchException: Ambiguous matching in method resolution System.Reflection.Binder.FindMostDerivedMatch (System.Reflection.MethodBase[] match) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/Binder.cs:106) System.MonoType.GetMethodImpl (System.String name, BindingFlags bindingAttr, System.Reflection.Binder binder, CallingConventions callConvention, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/MonoType.cs:245) System.Type.GetMethod (System.String name, BindingFlags bindingAttr) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Type.cs:787) Sirenix.OdinInspector.Editor.UnityPropertyHandlerUtility..cctor () (at F:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Core/Context/PropertyContext.cs:60) Rethrow as TypeInitializationException: An exception was thrown by the type initializer for Sirenix.OdinInspector.Editor.UnityPropertyHandlerUtility Sirenix.OdinInspector.Editor.UnityPropertyDrawer2[UnityEditorInternal.UnityEventDrawer,UnityEngine.Events.UnityEvent]..ctor () Sirenix.OdinInspector.Editor.Drawers.UnityEventDrawer1[UnityEngine.Events.UnityEvent]..ctor () (at F:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Drawers/Value Drawers/Vector4Drawer.cs:66) System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:513) Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation. System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:519) System.Reflection.MonoCMethod.Invoke (BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:528) System.Reflection.ConstructorInfo.Invoke (System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/ConstructorInfo.cs:77) System.Activator.CreateInstance (System.Type type, Boolean nonPublic) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Activator.cs:372) System.Activator.CreateInstance (System.Type type) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Activator.cs:254) Sirenix.OdinInspector.Editor.DrawerLocator.GetDrawer (System.Type drawerType, Boolean forceUniqueDrawerInstance) Sirenix.OdinInspector.Editor.DrawerLocator+<>c__DisplayClass35_0.<GetAllDrawers>b__2 (Sirenix.OdinInspector.Editor.DrawerInfo info) UnityEngine.Debug:LogException(Exception) Sirenix.OdinInspector.Editor.<>c__DisplayClass35_0:<GetAllDrawers>b__2(DrawerInfo) System.Linq.<CreateWhereIterator>c__Iterator1D1:MoveNext() Sirenix.Utilities.<Append>d__191:MoveNext() (at F:/Sirenix/Sirenix Solution/Sirenix.Utilities/Extensions/LinqExtensions.cs:343) System.Linq.Enumerable:ToArray(IEnumerable1) Sirenix.OdinInspector.Editor.DrawerLocator:GetAllDrawers(Type, Type, List1, Boolean) Sirenix.OdinInspector.Editor.DrawerLocator:GetValueDrawers(Type) (at F:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Core/Infos/InspectorPropertyInfo.cs:710) Sirenix.OdinInspector.Editor.DrawerLocator:GetDrawersForMemberInfo(MemberInfo, Type, Boolean) (at F:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Core/Infos/InspectorPropertyInfo.cs:524) Sirenix.OdinInspector.Editor.DrawerLocator:GetDrawersForProperty(InspectorProperty) (at F:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Core/Infos/InspectorPropertyInfo.cs:535) Sirenix.OdinInspector.Editor.InspectorUtilities:DrawProperty(InspectorProperty, GUIContent) Sirenix.OdinInspector.Editor.InspectorUtilities:DrawProperty(InspectorProperty) Sirenix.OdinInspector.Editor.InspectorUtilities:DrawPropertiesInTree(PropertyTree) Sirenix.OdinInspector.Editor.PropertyTree:Draw(Boolean) Sirenix.OdinInspector.Editor.OdinEditor:DrawTree() (at F:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Core/Children/PropertyValueCollection.cs:541) Sirenix.OdinInspector.Editor.OdinEditor:DrawOdinInspector() (at F:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Core/Children/PropertyValueCollection.cs:533) Sirenix.OdinInspector.Editor.OdinEditor:OnInspectorGUI() (at F:/Sirenix/Sirenix Solution/Sirenix.OdinInspector.Editor/Core/Children/PropertyValueCollection.cs:516) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

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